Bumper beam assembly system

ABSTRACT

Provided is a bumper beam assembly system. The A bumper beam assembly system includes a bumper beam and a stay connecting the bumper beam to a vehicle, wherein the stay is replaceably coupled to both sides of the bumper beam to occupy a corner portion of the bumper beam.

TECHNICAL FIELD

The present invention relates to a bumper beam assembly system for avehicle, and more particularly, to a bumper beam assembly system whichis capable of minimizing repair costs of a corner part when the cornerportion is crashed at a low speed.

BACKGROUND ART

A bumper beam assembly represents a functional part protecting a framewhen a vehicle is crashed at a low speed and is usually provided with abumper beam and a stay. In this case, the bumper beam may absorb most ofcrash energy, and the stay may absorb the rest of the crash energy. Thatis, the bumper beam that is directly crashed may firstly absorb thecrash energy, and the stay through which the bumper beam is connected tothe frame to support the bumper beam may secondly absorb the crashenergy.

Required performance of the bumper beam assembly constituted asdescribed above may be tested through two tests such as a low speedcrash regulation test and a repair cost evaluation crash test which isperformed by General Insurance Association (Insurance Institute forHighway Safety (IIHS) and Research Council for Automobile Repairs(RCAR)). In particular, since the low speed crash test performed byGeneral Insurance Association may evaluate the repair costs after a lowspeed crash to utilize a standard for appropriating a premium, and thusthe low speed crash test has a large effect on vehicle sales. Thus, mostautomobile manufacturers are putting a great deal of effort to develop abumper beam assembly having cheap repair costs in consideration of therepair cost evaluation (commercial value evaluation) performed byGeneral Insurance Association.

In this regard, IIHS may offset a central portion of a vehicle bumperand about 15% of an overall width of the vehicle by using a bumper dummyto perform a low speed crash test at about 10 KPH and about 5 KPH, asshown in FIG. 1, thereby appropriating the repair costs and announcingto mass communication. For reference, a result of the low speed crashtest performed by IIHS is exemplified in FIG. 2. Generally, a bumperbeam having excellent performance may have repair costs required whenthe bumper beam assembly and the bumper cover assembly are replacedwithout being damaged in itself after the test is performed by IIHS.

In recent years, a bumper beam formed of a low-weight, high-performanceplastic composite material is widely applied so as to improve fuelefficiency. Since the plastic composite material is lighter than steel,the plastic composite material may be effective in aspects of vehiclefuel efficiency. However, since the plastic composite material isrelatively expensive when compared to that of the steel, the repair costevaluation performed by General Insurance Association may cause poorresults due to the high replacement costs. Also, the bumper beam formedof the plastic composite material may have high strength throughcompression-molding. However, the bumper beam may be weak in strength atboth ends thereof due to the compression-molding. As a result, thedamaged beam and deformed stay should be replaced in the 15% offset testperformed by IIHS (hereinafter, referred to as an “IIHS 15% offsettest”).

In detail, bumper assemblies having various shapes are disclosed inKorean Patent Application Nos. 10-2008-0069637, 10-2009-0081580,10-2007-0002937, 10-2009-0093518, 10-2008-0059204 and 10-2011-0122098.However, in the related arts above described, as shown in FIG. 3, simpleand usual steel beams or plastic composite material beams are provided.Also, since an extruded crash box for a vehicle is disposed behind thebumper beam, the bumper beam may be firstly crashed and damaged, andthen the stay or crash box may be deformed or damaged in the IIHS 15%offset test. Therefore, costs for replacing the whole bumper beamassembly may be required.

DISCLOSURE Technical Problem

The present invention provides a bumper beam assembly system in whichrepair costs for replacing components damaged when the vehicle iscrashed at a low speed are reduced to satisfy an IIHS 15% offset test.

The present invention also provides the bumper beam assembly whichovercomes a limitation in a shape of a stay and improves vehicle fuelefficiency through weight lighting thereof.

Technical Solution

According to an aspect of the present invention, a bumper beam assemblysystem includes: a bumper beam; and a stay connecting the bumper beam toa vehicle, wherein the stay is replaceably coupled to both sides of thebumper beam to occupy a corner portion of the bumper beam.

The stay may include a bucket structure or a partition wall structure.

The bucket structure may include: a frame assembly part that is coupledto a frame; a first sidewall disposed on one side of the frame assemblypart to constitute the corner portion of the bumper beam; a secondsidewall disposed on the other side of the frame; and a bumper beamassembly part extending from the frame assembly part, the firstsidewall, and the second sidewall in a flange shape and coupled to thebumper beam.

The partition wall structure may include: a first outer wall couples toa rare end of the bumper beam; a second outer wall disposed on one sideof the first outer wall to constitute the corner portion of the bumperbeam; a third outer wall disposed on the other side of the first outerwall; a fourth outer wall connecting the second outer wall to the thirdouter wall, the fourth outer wall being couple to the frame; and atleast one partition wall vertically connecting the first outer wall tothe fourth outer wall.

The stay may be formed of steel or a thermoplastic or thermosettingcomposite material.

The composite material may include a synthetic resin and a glass fiberand is press-molded.

Advantageous Effects

According to the present invention, the stay may be separably mounted onboth side ends of the bumper beam so that only the damaged stay isreplaced when the corner portion of the bumper beam is crashed tosignificantly reduce the repair costs.

Also, since the all of the steel and the plastic composite material areused as the stay, the stay is very superior in applicability.Particularly, if it is difficult to mold the stay by using the steelmaterial, the plastic composite material may be used to freely realizethe desired shapes as well as to improve the vehicle fuel efficiencythrough the weight lighting of the stay.

DESCRIPTION OF DRAWINGS

The above and other features and advantages of the present inventionwill become more apparent by describing in detail exemplary embodimentsthereof with reference to the attached drawings in which:

FIG. 1 is a view illustrating a process of an IIHS low speed crash test;

FIG. 2 is a view exemplifying a result of an IIHS low speed crash test;

FIG. 3 is a view of a steel bumper beam assembly and a plastic compositematerial bumper beam assembly according to a related art;

FIG. 4 is an exploded perspective view of a bumper beam assembly systemaccording to an embodiment of the present invention;

FIG. 5 is a front view of the bumper beam assembly system according toan embodiment of the present invention;

FIG. 6 is a plan view of the bumper beam assembly system according to anembodiment of the present invention;

FIG. 7 is a view illustrating a stay of the bumper beam assembly systemaccording to an embodiment of the present invention;

FIG. 8 is a plan view of a bumper beam assembly system according toanother embodiment of the present invention;

FIG. 9 is a front view of the bumper beam assembly system according toanother embodiment of the present invention;

FIG. 10 is a plan view of the bumper beam assembly system according toanother embodiment of the present invention; and

FIG. 11 is a view illustrating a stay of the bumper beam assembly systemaccording to another embodiment of the present invention.

BEST MODE

The present invention will now be described more fully with reference tothe accompanying drawings, in which exemplary embodiments of theinvention are shown. The present invention may, however, be embodied indifferent forms and should not be construed as limited to theembodiments set forth herein. In the drawings, anything unnecessary fordescribing the present disclosure will be omitted for clarity, and likereference numerals refer to like elements throughout.

FIG. 4 is an exploded perspective view of a bumper beam assembly systemaccording to an embodiment of the present invention, FIG. 5 is a frontview of the bumper beam assembly system according to an embodiment ofthe present invention, and FIG. 6 is a plan view of the bumper beamassembly system according to an embodiment of the present invention.

As shown in FIGS. 4 to 6, a bumper beam assembly system 100 according toan embodiment of the present invention may include a bumper beam 110 anda stay 120. Here, the current embodiment is characterized in that thebumper beam 110 is shortened in length, and then the stay 120 is appliedon the shortened portion of the bumper beam 110. Hereinafter, each ofparts will be described in detail.

The bumper beam 110 is configured to absorb an impact generated when avehicle is frontally crashed. The bumper beam 110 is connected to aframe by the stay 120. The bumper beam may be compression-molded byusing a plastic composite material. The bumper beam 110 may have alength (L) shorter than that of the bumper beam according to the relatedart as described above. In detail, as shown in FIG. 6, the length (L) ofthe bumper beam may be determined in consideration of a crash positionand gap (G) so that the bumper beam 110 may do not overlap a barrier 300in an IIHS corner bumper dummy test.

The stay 120 is configured to absorb an impact generated when a cornerportion of the vehicle is crashed. The stay 120 is coupled to the bumperbeam 110 by using a coupling unit 130. The present invention ischaracterized in that the stay 120 occupies both ends of the bumper beam110. That is, the stay 120 may be disposed on the portion of the bumperbeam 110 of which the length is reduced. Thus, only the stay 120 damagedwhen the corner portion is crashed at a low speed may be replaced tosignificantly reduce repair costs. Hereinafter, a structure of the stay120 will be described below in more detail with reference to theaccompanying drawings.

FIG. 7 is a view illustrating the stay of the bumper beam assemblysystem according to an embodiment of the present invention.

Referring to FIG. 7, the stay 120 includes a frame assembly part 121having an approximately ‘

’ shape in sectional structure and coupled to the frame, a firstsidewall 122 disposed on one side of the frame assembly part 121 toconstitute a corner portion of the bumper beam 110, a second sidewall123 disposed on the other side of the frame assembly part 121, and abumper beam assembly part 124 extending from each of the frame assemblypart 121, the first sidewall 122, and the second sidewall 123 in aflange shape and coupled to the bumper beam 110.

That is, the stay 120 according to the present invention may be providedin a bucket shape of which one side is opened to define an empty spacetherein. Thus, the bumper beam 110 may be inserted to the empty space tobutt-couple the bumper beam 110 to the frame in a state where the stay120 is coupled to the bumper beam 110.

In this case, the first sidewall 122 may have a predetermined angle θ1with respect to the frame assembly part 121 in consideration of anoverlapping amount (about 15% of an overall width of the vehicle) in theIIHS corner bumper dummy test. Also, the second sidewall 123 may have apredetermined angle θ2 with respect to the frame assembly part 121 inconsideration of the IIHS corner bumper dummy test.

The stay 120 may be molded through press-drawing by using a steelmaterial or may be press-compression molded by using a plastic compositematerial. However, since each of most vehicles being released at thepresent have a great package space, it may be difficult to mold the stay120 by using a steel material for which deep-drawing is required. Thus,in this case, an easily moldable plastic composite material may be used.As a result, a limitation in shape realization may be overcome, andalso, fuel efficiency may be improved through weight lighting of thestay 120. In this case, a thermoplastic composite material and athermosetting composite material, which contain a synthetic resin and aglass fiber, may be used as the plastic composite material.

The bumper beam assembly system according to an embodiment of thepresent invention was described above. Hereinafter, a bumper beamassembly system according to another embodiment of the present inventionwill be described with reference to the accompanying drawings.

FIG. 8 is a plan view of a bumper beam assembly system according toanother embodiment of the present invention, FIG. 9 is a front view ofthe bumper beam assembly system according to another embodiment of thepresent invention, and FIG. 10 is a plan view of the bumper beamassembly system according to another embodiment of the presentinvention.

As shown in FIGS. 8 to 10, a bumper beam assembly system 200 accordingto another embodiment of the present invention may include a bumper beam210 and a stay 220, like the foregoing embodiment. However, the stay 220may have a structure different from that of the foregoing embodiment.Hereinafter, stay 220 will be described below in detail with referenceto the accompanying drawings.

FIG. 11 is a view illustrating the stay of the bumper beam assemblysystem according to another embodiment of the present invention.

Referring to FIG. 11, the stay 220 may include a partition wallstructure including a plurality of outer walls 221, 222, 223, and 224and partition walls 225 and 226.

In detail, the outer walls 221, 222, 223, and 224 may include a firstouter wall 221 coupled to a rear end of the bumper beam 210, a secondouter wall 222 disposed on one side of the first outer wall 221 toconstitute a corner portion of the bumper beam 210, a third outer wall223 disposed on the other side of the first outer wall 221, and a fourthouter wall 224 connecting the second outer wall 222 to the third outerwall 223 and couple to the frame. As a result, the outer walls 221, 222,223, and 224 may define a space therein. The partition walls 225 and 226may be vertically disposed at a uniform distance between the first outerwall 221 and the fourth outer wall 224 to provide a supporting force.

In this case, the second outer wall 222 may be bent at a predeterminedangle θ3 with respect to the fourth outer wall 224 in consideration ofan overlapping amount (about 15% of an overall width of the vehicle) inan IIHS corner bumper dummy test. Also, the third outer wall 223 may bebent at a predetermined angle θ4 with respect to the fourth outer wall224 in consideration of the IIHS corner bumper dummy test.

Unlike the stay formed by using steel or aluminum according to therelated art, the stay 220 may be injection or extrusion-molded by usinga thermoplastic or a thermosetting plastic to improve vehiclefuel-efficiency through weight lighting thereof.

The exemplary embodiments of the present invention were described indetail with reference to the accompanying drawings. The above-disclosedsubject matter is to be considered illustrative, and not restrictive,and the appended claims are intended to cover all such modifications,enhancements, and other embodiments, which fall within the true spiritand scope of the present invention. Thus, to the maximum extent allowedby law, the scope of the present invention is to be determined by thebroadest permissible interpretation of the following claims and theirequivalents, and shall not be restricted or limited by the foregoingdetailed description.

The exemplary embodiments of the present invention were described indetail with reference to the accompanying drawings. The description ofthe present invention is intended to be illustrative, and those withordinary skill in the technical field of the present invention pertainswill be understood that the present invention can be carried out inother specific forms without changing the technical idea or essentialfeatures.

While the present invention has been particularly shown and describedwith reference to exemplary embodiments thereof, it will be understoodby those of ordinary skill in the art that various changes in form anddetails may be made therein without departing from the spirit and scopeof the present invention as defined by the following claims.

1. A bumper beam assembly system comprising: a bumper beam; and a stayconnecting the bumper beam to a vehicle, wherein the stay is replaceablycoupled to both sides of the bumper beam to occupy a corner portion ofthe bumper beam.
 2. The bumper beam assembly system of claim 1, whereinthe stay comprises a bucket structure or a partition wall structure. 3.The bumper beam assembly system of claim 2, wherein the bucket structurecomprises: a frame assembly part that is coupled to a frame; a firstsidewall disposed on one side of the frame assembly part to constitutethe corner portion of the bumper beam; a second sidewall disposed on theother side of the frame; and a bumper beam assembly part extending fromthe frame assembly part, the first sidewall, and the second sidewall ina flange shape and coupled to the bumper beam.
 4. The bumper beamassembly system of claim 2, wherein the partition wall structurecomprises: a first outer wall couples to a rare end of the bumper beam;a second outer wall disposed on one side of the first outer wall toconstitute the corner portion of the bumper beam; a third outer walldisposed on the other side of the first outer wall; a fourth outer wallconnecting the second outer wall to the third outer wall, the fourthouter wall being couple to the frame; and at least one partition wallvertically connecting the first outer wall to the fourth outer wall. 5.The bumper beam assembly system of claim 1, wherein the stay is formedof steel or a thermoplastic or thermosetting composite material.
 6. Thebumper beam assembly system of claim 5, wherein the composite materialcomprises a synthetic resin and a glass fiber and is press-molded.